Electron Diffraction Tomography on Two-Phase Nanolamellae of Topochemically Synthesized Cu(SbS)Cl.

The dark red semiconductor Cu(SbS)Cl was obtained by leaching the layered precursor Cu(SbS)[AlCl] in a 0.1 M aqueous HCl solution. The selective extraction of AlCl yielded a mica-like lamellar product of poor crystallinity.

Deciphering the Polymorphism of CaSi: The Influence of Heat and Composition.

The Zintl phase CaSi is a layered compound with stacking variants known as 1P, 3R, and 6R. We extend the series by the 21R polytype formed by rapid cooling of the melt. The crystal structure of 21R-CaSi (space group 3̅) was derived from HRTEM images, and the atomic positions were optimized by using the FPLO code ( = 3.

Ge Co : Creating "Empty" Space by High Pressure.

The compound Ge Co (x=0.54(6), a=10.9861(3) Å, space group Im m) prepared under high pressure and at high temperature is metastable under ambient conditions.

A Borosilicide with Clathrate VIII Structure.

The high-pressure phase NaBSi (3 < < 5) is the first representative of a borosilicide crystallizing in the rarely occurring clathrate VIII type structure. Crystals with composition NaBSi (space group 43̅; = 9.7187(2) Å; Pearson symbol 54) were obtained at 5-8 GPa and 1200 K.

Superconductivity of structurally disordered YIrSn.

The structural and physical properties of YIrSn grown from Sn-flux as large single crystals are studied. YIrSn crystallizes with a unique structure [space group 3̄, = 13.7706(1) Å], which is characterized by a strong disorder.

Composition dependent polymorphism and superconductivity in Y{Rh,Ir}Ge.

Polymorphism is observed in the YRhGe series. The decrease of Y-content leads to the transformation of the primitive cubic YRhGe [ = 0.6, space group 3̄, = 8.

The Intermetallic Semiconductor -IrGa: a Material in the State.

The compound IrGa was synthesized by direct reaction of the elements. It is formed as a high-temperature phase in the Ir-Ga system. Single-crystal X-ray diffraction analysis confirms the tetragonal symmetry (space group 4 , No.

Crystal structure, phase transition and properties of indium(III) sulfide.

Poly- and single-crystalline samples of In0.67□0.33In2S4 thiospinel were obtained by various powder metallurgical and chemical vapor transport methods, respectively.

In-Cage Interactions in the Clathrate Superconductor Sr Si.

The clathrate I superconductor Sr Si is obtained under high-pressure high-temperature conditions, at 5 GPa and temperatures in the range of 1273 to 1373 K. At ambient pressure, the compound decomposes upon heating at T=796(5) K into Si and SrSi . The crystal structure of the clathrate is isotypic to that of Na Si .

Unconventional Metal-Framework Interaction in MgSi.

The silicon-rich cage compound MgSi was obtained by high-pressure high-temperature synthesis. Initial crystal structure determination by electron diffraction tomography provided the basis for phase analyses in the process of synthesis optimization, finally facilitating the growth of single crystals suitable for X-ray diffraction experiments. The crystal structure of MgSi (space group Cmme, Pearson notation oS24, a=4.

Indium thiospinel In□InS- structural characterization and thermoelectric properties.

A detailed study of polycrystalline indium-based In□InS (x = 0.16, 0.22, 0.

Compositional evolution of the NaZn structure motif in the systems La-Ni-Ga and Ce-Ni-Ga.

Phase relationship and structural behaviour in the substitutional series LaNiGa and CeNiGa have been studied by a combination of X-ray powder diffraction measurements, differential scanning calorimetry, electron diffraction tomography and metallographic analyses. The sequence of morphotropic phase transformations has been found in the series LaNiGa resulting in five varieties of the NaZn structure: the cubic phase with aristotype structure at x = 2 (space group Fm3[combining macron]c, Pearson symbol cF112), two tetragonal phases at x = 2.5-4.

Local magnetism in MnSiPt rules the chemical bond.

Among intermetallic compounds, ternary phases with the simple stoichiometric ratio 1:1:1 form one of the largest families. More than 15 structural patterns have been observed for several hundred compounds constituting this group. This, on first glance unexpected, finding is a consequence of the complex mechanism of chemical bonding in intermetallic structures, allowing for large diversity.

μm- and nm-Sized Catalytic Structures in Heat Sources for Thermoelectric Generators.

Micro- and nano-structural organization and its influence on the efficiency of catalysts used in the heat sources for permeable thermoelectric generators were investigated. Two types of catalyst were studied–elemental platinum on aluminum oxide granulate Pt/Al₂O₃ and mixed transition-metal catalyst on fibrous silicon dioxide Co–Cr–Pd–Sr/SiO₂. The distribution of active components in catalytic structures which contribute to the maximum combustion completeness of organic fuel in heat sources was investigated.

Redox Route from Inorganic Precursor LiC to Nanopatterned Carbon.

We present the synthesis route to carbon with hierarchical morphology on the nanoscale. The structures are generated using crystalline orthorhombic lithium carbide (LiC) as precursor with nanolamellar organization. Careful treatment by SnI oxidizes carbon at the fairly low temperature of 80 °C to the elemental state and keeps intact the initial crystallite shape, the internal lamellar texture of particles, and the lamellae stacking.

Sol-Gel-Prepared Nanoparticles of Mixed Praseodymium Cobaltites-Ferrites.

Two series of nanocrystalline powders of PrCo1 - x Fe x O3 (x = 0.1, 0.3, 0.

Classical and nonclassical germanium environments in high-pressure BaGe5.

A new crystalline form of BaGe(5) was obtained at a pressure of 15(2) GPa in the temperature range from 1000(100) to 1200(120) K. Single-crystal electron and powder X-ray diffraction patterns indicate a body-centered orthorhombic structure (space group Imma, Pearson notation oI24) with unit cell parameters a = 8.3421(8) Å, b = 4.

Structural evolvement and thermoelectric properties of Cu(3-x)Sn(x)Se₃ compounds with diamond-like crystal structures.

Polycrystalline samples of Cu(3-x)Sn(x)Se3 were synthesized in the composition range x = 0.87-1.05.

The inner structure of human otoconia.

Background: The architecture of human otoconia has been only poorly understood up to now. Currently, it is assumed that otoconia contain a central core surrounded by a shell.

Objectives: To investigate the inner structure of human otoconia.

New monoclinic phase at the composition Cu2SnSe3 and its thermoelectric properties.

A new monoclinic phase (m2) of ternary diamond-like compound Cu2SnSe3 was synthesized by reaction of the elements at 850 K. The crystal structure of m2-Cu2SnSe3 was determined through electron diffraction tomography and refined by full-profile techniques using synchrotron X-ray powder diffraction data (space group Cc, a = 6.9714(2) Å, b = 12.

Homo- and heterovalent substitutions in the new clathrates I Si30P16Te(8-x)Se(x) and Si(30+x)P(16-x)Te(8-x)Br(x): synthesis, crystal structure, and thermoelectric properties.

The new cationic clathrates I Si(30)P(16)Te(8-x)Se(x) and Si(30+x)P(16-x)Te(8-x)Br(x) were synthesized by the standard ampule technique. The Si(30)P(16)Te(8-x)Se(x) (x = 0-2.3) clathrates crystallize in the cubic space group Pm3̅n with the unit cell parameter a ranging from 9.

ZSM-5 zeolite single crystals with b-axis-aligned mesoporous channels as an efficient catalyst for conversion of bulky organic molecules.

The relatively small and sole micropores in zeolite catalysts strongly influence the mass transfer and catalytic conversion of bulky molecules. We report here aluminosilicate zeolite ZSM-5 single crystals with b-axis-aligned mesopores, synthesized using a designed cationicamphiphilic copolymer as a mesoscale template. This sample exhibits excellent hydrothermal stability.

Mimicking the growth of a pathologic biomineral: shape development and structures of calcium oxalate dihydrate in the presence of polyacrylic acid.

The morphogenesis of calcium oxalate hydrates in aqueous solutions was investigated by varying the pH, oxalate concentration, and the concentration of the sodium salt of polyacrylate (PAA). With increasing amounts of PAA in solution, the shape of tetragonal calcium oxalate dihydrate (COD) changes from bipyramidal through elongated bipyramidal prisms to dumbbells and finally reverts to rodlike tetragonal bipyramidal prisms. PAA is incorporated into the prismatic zones of the growing COD crystals, thereby reducing the growth rate of the {100} faces along the <100> direction.